Letter from attorney Thomas J. Croff to Carl Hayden informing him of the Atchison, Topeka, and Santa Fe railroad company's ownership of land inside the proposed national park boundaries.

Plan of Babel Canyon Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Arcube city structure Arcology design by Paolo Soleri, from 1970 exhibition at Corcoran Gallery of Art, Washington, DC

Model of Arcosanti Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Arcosanti Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Plan of Babel IIB Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Arcvillage II farm town Arcology design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Hexahedron Arcology city structure design by Paolo Soleri, from 1970 exhibition at Corcoran Gallery of Art, Washington, DC

Plan of Arcosanti Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Elevation plan of Babeldiga Dam Site Arcology design by Paolo Soleri, from 1970 exhibition at Corcoran Gallery of Art, Washington, DC